The interest of this thesis lies in spin transport in normal metals and superconducting half-metallic junctions.

Promotor: J. Aarts

This thesis consists of two subjects, that are both a consequence of radiation pressure.

Promotor: Prof.dr. C.W.J. Beenakker

Promotores: Prof.dr. D. Bouwmeester, Prof.dr. A. Fiore (TU Eindhoven)

In the Aarts lab we combine or structure materials, mostly in thin film form, in such a way that the hybrid has different and novel properties or functionalities.

Promotores: Prof.dr. J. Zaanen & Prof.dr. K.E. Schalm

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Oort, Niels Bohrweg 2, 2333 CA, Leiden

Sylvius, Sylviusweg 72, 2333 BE, Leiden

Reuvens, Reuvensplaats 2-4, 2311 BE, Leiden

Lipsius, Cleveringaplaats 1, 2311 BD, Leiden

Gorlaeus Building, Einsteinweg 55, 2333 CC, Leiden

Wijnhaven, Turfmarkt 99, 2511 DP, The Hague

Snellius, Niels Bohrweg 1, 2333 CA, Leiden

Reuvens, Reuvensplaats 2-4, 2311 BE, Leiden

Plexus Student Centre, Kaiserstraat 25, 2311 GN, Leiden

Arsenaal, Arsenaalstraat 1, 2311 CT, Leiden

Kamerlingh Onnes Building, Steenschuur 25, 2311 ES, Leiden

Academy Building, Rapenburg 73, 2311 GJ, Leiden

Oude UB, Rapenburg 70, 2311 EZ, Leiden

Willem Einthoven, Kolffpad 1, 2333 BN, Leiden

LUMC Research Building, Einthovenweg 20, 2333 ZC, Leiden

LUMC Education Building, Hippocratespad 21, 2333 ZD, Leiden

Herta Mohr, Witte Singel 27A, 2311 BG, Leiden

Anna van Buerenplein, Anna van Buerenplein 301, 2595 DG, The Hague

Van Steenis, Einsteinweg 2, 2333 CC, Leiden

Beehive Student Centre, Turfmarkt 104, 2511 DC, The Hague

Johan Huizinga, Doelensteeg 16, 2311 VL, Leiden

Old Observatory, Sterrenwachtlaan 11, 2311 GW, Leiden

P.J. Veth, Nonnensteeg 1-3, 2311 VJ, Leiden

FSW building, Wassenaarseweg 52, 2333 AK, Leiden

CrO2, a half-metal ferromagnet, has shown great promise for superconducting spintronics applications for nearly two decades.

This thesis is devoted to an in-depth examination of the various effects of disorder in the cuprate high-temperature superconductors.

Nature publishes an article on a paradoxical discovery in superconductivity. Physicists are searching for superconductivity at high temperatures so that less cooling is needed in for example MRI machines. News & Views article by Prof. Jan Zaanen in the same issue of August 19th.

If computers work on superconducting current, they won’t consume any energy. Leiden physicists have now gained control over a new type of superconducting memory elements. Publication in Nature Communications.

Promotor: C.W.J. Beenakker, Co-Promotor: A.R. Akhmerov

In unconventional high temperature superconductors, supercurrent vortices are known to spoil the Landau levels. In this thesis the emergence of Landau levels is studied in different types of superconductors: Weyl superconductors, and the Fu-Kane heterostructure.

Triplet superconductivity refers to a condensate of equal-spin Cooper pairs (pairs of electrons with equal spin).

We find ourselves in an era of transition, not just towards a more computing- and data-driven society but also away from unsustainable fossil fuels as an energy source.

Superconducting devices such as SQUIDS (Superconducting Quantum Interferometry Device) can perform ultra-sensitive measurements of magnetic fields. Leiden physicsts invented a method to 3D-print these and other superconducting devices in minutes.

This thesis presents insights from our study of various correlated electron systems with a scanning tunneling microscope (STM). In ordinary metals, electron-electron interactions exist, but get substantially screened due to the sheer number of electrons.

Unconventional superconductors form one of the big mysteries in physics. Among them is strontium ruthenate, which stands out as a controversial superconductor. During his PhD, Leiden physicist Kaveh Lahabi has provided new insights into the nature of superconductivity in this material, leading to a…

In this thesis we use Josephson and noise scanning tunneling microscopy for the study of conventional, unconventional (iron-based) and disordered superconductors. On the one hand, Josephson scanning tunneling microscopy allows us to directly visualize the superfluid density with high spatial resolut…

The behaviour of strongly correlated electron systems, such as high-temperature superconductors, defies explanation in the language of ordinary quantum theory. A seemingly unrelated area of physics, string theory, might give physicists a better understanding of the weird behaviour of these kinds of…

Since 2015 the United Nations have declared 11 February the International Day of Women and Girls in Science. Leiden University organized a public event for over a hundred visitors. In between a lecture on the building blocks of life and a talkshow on the impact of science on society, high school students…

Koen Bastiaans and his colleagues discovered a new quantum liquid unlike anything ever seen. They did it by using a technique that can be compared to listening to the sound of raindrops falling on a roof. Publication in Science 29 October.

Experimental physicist Jan Aarts has received a FOM Projectruimte grant of 545,000 euro. He will use the budget to study the interaction between superconducting currents and ferromagnetism. In the future, this might lead to computer memory with negligible energy consumption.

German scientists and NASA have developed a bacteria-killing coating for space toilets. With this coating they hope to protect astronauts in space stations from pathogens. Professor of Biological chemistry Nathaniel Martin sheds light on the discovery: 'You don't expect nasty bacteria up there, but…

Promotor: E.R. Eliel, Co-Promotor: M.J.A. de Dood